Previous studies in Louisiana (1, 2, 3) showed that milk cows apparently suffer from summer daytime atmospheric conditions. As a result, on warm days the grazing time between morning and evening milkings averaged less than 2 hours daily. While not grazing the cows were found in the shade. This time spent in the shade frequently was for periods of from 5 to 6 hours. During these periods cows did not have opportunity to refill their paunches unless they ventured into the sunshine, and this they did not do.
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Seath et al. (1947) studied this question.
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